We hear plenty of the negative, I say we get some positive! Happy moments, big accomplishments, neat things you've seen or done.
My happy moment:
I got a thank you card from the family of a wonderful patient I took care of last semester. They went through the hospital, the school, and three instructors to track down my address. Its a nice feeling that in a bumbling, student-y way, I gave their family member good enough care that they went through all that trouble to say "thanks."